JP5089081B2 - 発光装置 - Google Patents
発光装置 Download PDFInfo
- Publication number
- JP5089081B2 JP5089081B2 JP2006131210A JP2006131210A JP5089081B2 JP 5089081 B2 JP5089081 B2 JP 5089081B2 JP 2006131210 A JP2006131210 A JP 2006131210A JP 2006131210 A JP2006131210 A JP 2006131210A JP 5089081 B2 JP5089081 B2 JP 5089081B2
- Authority
- JP
- Japan
- Prior art keywords
- drive
- drive pulse
- pulse
- circuit
- pulse signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Description
2 コンベア
9 基板
32 光学系
33 撮像部
41,55 駆動パルス発生部
51 発光ダイオード
52,52a 駆動回路
53,53a 保護回路
331 撮像素子
531 ANDゲート
532,532a 積分回路
535 コンデンサ
821,822,831〜833,841,842,849,832a,842a パルス
Claims (3)
- フラッシュ光を出射する発光装置であって、
発光ダイオードと、
駆動パルス発生部からの駆動パルス信号が入力されるとともに、前記駆動パルス信号がONを示す間だけ前記発光ダイオードに連続点灯時の定格電流を超える駆動電流を供給する駆動回路と、
前記駆動パルス発生部と前記駆動回路との間に設けられ、予め設定されたパルス制限期間内に入力される前記駆動パルス信号のパルスの個数が所定の制限数よりも多い場合に、前記パルス制限期間内における前記パルスの個数を前記制限数に制限し、制限された前記駆動パルス信号を前記駆動回路へと出力する保護回路と、
を備え、
前記保護回路が、
コンデンサの充放電により前記駆動パルス信号の変化を緩和させた中間信号を生成する時定数回路である積分回路と、
前記駆動パルス信号と前記中間信号との論理演算により、前記パルス制限期間内におけるパルスの個数を前記制限数に制限し、制限された前記駆動パルス信号を出力する論理回路と、
を備え、
前記積分回路において、充電時の時定数が放電時の時定数よりも大きいことを特徴とする発光装置。 - 請求項1に記載の発光装置であって、
前記制限数が2または3であることを特徴とする発光装置。 - 請求項1または2に記載の発光装置であって、
前記保護回路が、入力される前記駆動パルス信号のパルスの幅が予め設定された制限パルス幅よりも長い場合に、前記パルスの前記幅を前記制限パルス幅に制限し、制限された前記駆動パルス信号を前記駆動回路へと出力することを特徴とする発光装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006131210A JP5089081B2 (ja) | 2006-05-10 | 2006-05-10 | 発光装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006131210A JP5089081B2 (ja) | 2006-05-10 | 2006-05-10 | 発光装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007305712A JP2007305712A (ja) | 2007-11-22 |
JP5089081B2 true JP5089081B2 (ja) | 2012-12-05 |
Family
ID=38839405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006131210A Expired - Fee Related JP5089081B2 (ja) | 2006-05-10 | 2006-05-10 | 発光装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP5089081B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010250114A (ja) * | 2009-04-16 | 2010-11-04 | Sanyo Electric Co Ltd | 発光素子駆動回路 |
JP7326073B2 (ja) * | 2019-09-05 | 2023-08-15 | 東芝テック株式会社 | Led駆動回路及び液体吐出観察装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62109379A (ja) * | 1985-11-08 | 1987-05-20 | Sharp Corp | 発光素子保護装置 |
JPH04284716A (ja) * | 1991-03-13 | 1992-10-09 | Toshiba Corp | パルス幅調整装置 |
JP3209938B2 (ja) * | 1997-01-10 | 2001-09-17 | 富士通株式会社 | 発光素子の保護装置及び発光素子の保護方法 |
JP4279698B2 (ja) * | 2004-01-30 | 2009-06-17 | シャープ株式会社 | Led素子の駆動方法及び駆動装置、照明装置並びに表示装置 |
JP2006084444A (ja) * | 2004-09-17 | 2006-03-30 | Dainippon Screen Mfg Co Ltd | 画像取得装置 |
WO2007004530A1 (ja) * | 2005-06-30 | 2007-01-11 | Pioneer Corporation | 照明光通信装置および照明光通信方法 |
-
2006
- 2006-05-10 JP JP2006131210A patent/JP5089081B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP2007305712A (ja) | 2007-11-22 |
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